]>
Commit | Line | Data |
---|---|---|
a187ac95 RS |
1 | /* Handle #pragma, system V.4 style. Supports #pragma weak and #pragma pack. |
2 | Copyright (C) 1992 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GNU CC. | |
5 | ||
6 | GNU CC is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU CC is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU CC; see the file COPYING. If not, write to | |
940d9d63 RK |
18 | the Free Software Foundation, 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
a187ac95 | 20 | |
4b578ebf RS |
21 | #include <stdio.h> |
22 | #include "config.h" | |
23 | #include "tree.h" | |
ca695ac9 | 24 | #include "function.h" |
6be160ff | 25 | #include "defaults.h" |
3d6f7931 | 26 | #include "c-pragma.h" |
4b578ebf | 27 | |
a187ac95 RS |
28 | #ifdef HANDLE_SYSV_PRAGMA |
29 | ||
30 | /* When structure field packing is in effect, this variable is the | |
31 | number of bits to use as the maximum alignment. When packing is not | |
0f41302f | 32 | in effect, this is zero. */ |
a187ac95 RS |
33 | |
34 | extern int maximum_field_alignment; | |
35 | ||
a3100298 TW |
36 | /* File used for outputting assembler code. */ |
37 | extern FILE *asm_out_file; | |
38 | ||
a187ac95 RS |
39 | /* Handle one token of a pragma directive. TOKEN is the |
40 | current token, and STRING is its printable form. */ | |
41 | ||
42 | void | |
43 | handle_pragma_token (string, token) | |
44 | char *string; | |
45 | tree token; | |
46 | { | |
ca695ac9 | 47 | static enum pragma_state state = ps_start, type; |
a187ac95 RS |
48 | static char *name; |
49 | static char *value; | |
50 | static int align; | |
51 | ||
52 | if (string == 0) | |
53 | { | |
54 | if (type == ps_pack) | |
55 | { | |
56 | if (state == ps_right) | |
57 | maximum_field_alignment = align * 8; | |
58 | else | |
59 | warning ("malformed `#pragma pack'"); | |
60 | } | |
a187ac95 RS |
61 | else if (type == ps_weak) |
62 | { | |
a3100298 TW |
63 | #ifdef HANDLE_PRAGMA_WEAK |
64 | if (HANDLE_PRAGMA_WEAK) | |
3d6f7931 | 65 | handle_pragma_weak (state, name, value); |
ca695ac9 | 66 | |
a3100298 | 67 | #endif /* HANDLE_PRAMA_WEAK */ |
a187ac95 | 68 | } |
a187ac95 RS |
69 | |
70 | type = state = ps_start; | |
71 | return; | |
72 | } | |
73 | ||
74 | switch (state) | |
75 | { | |
76 | case ps_start: | |
77 | if (token && TREE_CODE (token) == IDENTIFIER_NODE) | |
78 | { | |
79 | if (strcmp (IDENTIFIER_POINTER (token), "pack") == 0) | |
80 | type = state = ps_pack; | |
a187ac95 RS |
81 | else if (strcmp (IDENTIFIER_POINTER (token), "weak") == 0) |
82 | type = state = ps_weak; | |
a187ac95 RS |
83 | else |
84 | type = state = ps_done; | |
85 | } | |
86 | else | |
87 | type = state = ps_done; | |
88 | break; | |
89 | ||
a187ac95 RS |
90 | case ps_weak: |
91 | if (token && TREE_CODE (token) == IDENTIFIER_NODE) | |
92 | { | |
93 | name = IDENTIFIER_POINTER (token); | |
94 | state = ps_name; | |
95 | } | |
96 | else | |
97 | state = ps_bad; | |
98 | break; | |
99 | ||
100 | case ps_name: | |
101 | state = (strcmp (string, "=") ? ps_bad : ps_equals); | |
102 | break; | |
103 | ||
104 | case ps_equals: | |
105 | if (token && TREE_CODE (token) == IDENTIFIER_NODE) | |
106 | { | |
107 | value = IDENTIFIER_POINTER (token); | |
108 | state = ps_value; | |
109 | } | |
110 | else | |
111 | state = ps_bad; | |
112 | break; | |
113 | ||
114 | case ps_value: | |
115 | state = ps_bad; | |
116 | break; | |
a187ac95 RS |
117 | |
118 | case ps_pack: | |
119 | if (strcmp (string, "(") == 0) | |
120 | state = ps_left; | |
121 | else | |
122 | state = ps_bad; | |
123 | break; | |
124 | ||
125 | case ps_left: | |
126 | if (token && TREE_CODE (token) == INTEGER_CST | |
127 | && TREE_INT_CST_HIGH (token) == 0) | |
128 | switch (TREE_INT_CST_LOW (token)) | |
129 | { | |
130 | case 1: | |
131 | case 2: | |
132 | case 4: | |
133 | align = TREE_INT_CST_LOW (token); | |
134 | state = ps_align; | |
135 | break; | |
136 | ||
137 | default: | |
138 | state = ps_bad; | |
139 | } | |
140 | else if (! token && strcmp (string, ")") == 0) | |
141 | { | |
142 | align = 0; | |
143 | state = ps_right; | |
144 | } | |
145 | else | |
146 | state = ps_bad; | |
147 | break; | |
148 | ||
149 | case ps_align: | |
150 | if (strcmp (string, ")") == 0) | |
151 | state = ps_right; | |
152 | else | |
153 | state = ps_bad; | |
154 | break; | |
155 | ||
156 | case ps_right: | |
157 | state = ps_bad; | |
158 | break; | |
159 | ||
160 | case ps_bad: | |
161 | case ps_done: | |
162 | break; | |
163 | ||
164 | default: | |
165 | abort (); | |
166 | } | |
167 | } | |
168 | #endif /* HANDLE_SYSV_PRAGMA */ |